.f {
  display: flex;
}

//上下左右居中
.f-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

// 修改方向
.f-direction {
  flex-direction: column;
}

// 左右居中
.f-justify-center {
  display: flex;
  justify-content: center;
}

.f-justify-around {
  display: flex;
  justify-content: flex-start;
  flex-wrap: wrap;
}

// 上下居中  两端靠齐
.f-j-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

//上下居中
.f-align-center {
  display: flex;
  align-items: center;
}

.f-j-start {
  display: flex;
  justify-content: flex-start;
}

.f-a-start {
  display: flex;
  align-items: flex-start;
}

.f-r-center {
  display: flex;
  justify-content: flex-end;
  align-items: center;
}

.f-l-center {
  display: flex;
  justify-content: flex-start;
  align-items: center;
}
